<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
    // 这个是根组件
    class App extends React.Component{
        state={
            count:0,
            isHot:true
        }
        render(){
            console.log("-----render-----");
            const{count,isHot}=this.state;
            return(
                <div>
                    <button onClick ={this.handle}>+</button>
                    <p>{count}</p>
                   <button onClick={this.changeWeaHandle}>切换天气</button>
                    <p>{isHot?"热啊":"冷啊"}</p>
                </div>
            )
        }
    // 事件函数
    handle =()=>{
        let {count}=this.state;
    //这样写是后面加一了 setState是设置的意思
        this.setState({count:count+1})
    }
    changeWeaHandle =()=>{
        const {isHot} = this.state;
        this.setState({isHot:!isHot})
    }
    
    }
    const root =ReactDOM.createRoot(document.getElementById('app'));
    root.render(<App/>)
    
    </script>
</body>
</html>